In contrast to the flowers and candles left at each location where an innocent victim was killed, locals have been piling stones and throwing cigarette butts at the point on Promenade des Anglais where the killer was shot dead.

The spot on the Promenade des Anglais, NiceCredit:
Guilhem Baker/PressFrame

One local has scrawled 'Assassin' in red paint on the ground.

Meanwhile, investigators have failed to establish links between the Bastille Day killer and Isil - despite the terror group claiming him as a 'soldier of Islam'. France's interior minister has played down the likelihood that the plot was orchestrated by a wider network as Bouhlel's mobile phone records reportedly showed he used dating sites to meet both men and women.

Watch | Bundles of flowers and notes mark the spots where people's bodies were found in Nice

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Bouhlel, who dabbled with drugs and drink, was 'unbalanced', French official Bernard Cazeneuve said.

According to officers, the phone is proving more important to the investigation than the seven suspects currently in custody.

People gather at a makeshift memorial on the Promenade des Anglais in NiceCredit:
AFP PHOTO / Valery HACHE

Three of those arrested have been transferred to the anti-terror centre in Levallois-Perret, near Paris. Local newspaper Nice Matin quotes a police source saying they have found evidence that the attacks were planned 'for weeks or months'.

A one-minute silence is taking place at midday on Monday in Nice in a ceremony at the Monument de Centenaire on the Promenade des Anglais.

Watch | French PM booed at Nice tribute for victims of terror attack

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Anti-riot police are expected out in force amid security fears. It has also emerged that only 35 of the dead have been formally identified because some bodies are so badly mutilated.

Mr Cazeneuve told RTL radio on Monday that Bouhlel’s alleged links with radical Islam currently relied solely on Isil’s claims of responsibility for the Nice carnage, which they released on a website at the weekend.

"We can not ignore the fact that he was an unbalanced and very violent individual, and it seems that his psychology demonstrates these traits," said Mr Cazeneuve.

If Bouhlel had indeed become an Islamist in the last days of his life, then it was due to 'rapid radicalisation', said Mr Cazeneuve.

A spokesman for Paris prosecutors, who are leading the investigation into the Nice slaughter, said 49 victims remained critical in Nice, with 18 of them still fighting for their lives.

The total number of injured was 249, and they included 35 children. Only 35 of the 84 dead have been formally identified, the spokesman added.